TM4C1231C3PM Datasheet, PDF (777/1145 Pages) Texas Instruments – Tiva™ TM4C1231C3PM Microcontroller

Tiva^™ TM4C1231C3PM Microcontroller
Figure 13-11. Internal Temperature Sensor Characteristic
V_TSENS
2.5 V
V_TSENS = 2.7 V – ^(TEMP+55)
75
1.633 V
0.833 V
-40° C
25° C
85° C Temp
The temperature sensor reading can be sampled in a sample sequence by setting the TSn bit in
the ADCSSCTLn register. The temperature reading from the temperature sensor can also be given
as a function of the ADC value. The following formula calculates temperature (TEMP in ℃) based
on the ADC reading (ADC_CODE, given as an unsigned decimal number from 0 to 4095) and the
maximum ADC voltage range (VREFP - VREFN):
TEMP = 147.5 - ((75 * (VREFP - VREFN) × ADC_CODE) / 4096)
13.3.7
Digital Comparator Unit
An ADC is commonly used to sample an external signal and to monitor its value to ensure that it
remains in a given range. To automate this monitoring procedure and reduce the amount of processor
overhead that is required, each module provides eight digital comparators.
Conversions from the ADC that are sent to the digital comparators are compared against the user
programmable limits in the ADC Digital Comparator Range (ADCDCCMPn) registers. The ADC
can be configured to generate an interrupt depending on whether the ADC is operating within the
low, mid or high-band region configured in the ADCDCCMPn bit fields. The digital comparators four
operational modes (Once, Always, Hysteresis Once, Hysteresis Always) can be additionally applied
to the interrupt configuration.
13.3.7.1
Output Functions
ADC conversions can either be stored in the ADC Sample Sequence FIFOs or compared using the
digital comparator resources as defined by the SnDCOP bits in the ADC Sample Sequence n
Operation (ADCSSOPn) register. These selected ADC conversions are used by their respective
digital comparator to monitor the external signal. Each comparator has two possible output functions:
processor interrupts and triggers.
Each function has its own state machine to track the monitored signal. Even though the interrupt
and trigger functions can be enabled individually or both at the same time, the same conversion
June 12, 2014
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